GitHub - cheshir/ttlcache: Simple in-memory key-value storage with TTL for each record. (original) (raw)

ttlcache

About

ttlcache – is a simple and efficient in-memory key value storage with TTL for each record.

The key is of uint64 type. Library provides wrappers for common types:

• IntKey
• ByteKey
• Int8Key
• Uint8Key
• Int16Key
• Uint16Key
• Int32Key
• Uint32Key
• Int64Key
• Uint64Key
• BytesKey ([]byte)
• StringKey
• AnyKey (interface{})

AnyKey is not suitable for very intensive usage. Consider writing your own hash function if your keys are complex types, and you faced performance degradation.

Installation

go get -u github.com/cheshir/ttlcache

Usage

package main

import ( "github.com/cheshir/ttlcache" )

const ( minute = 60 * time.Second hour = 60 * minute )

func main() { // How often we need to stop the world and remove outdated records. resolution := minute

cache := ttlcache.New(resolution)
cache.Set(ttlcache.StringKey("some key"), "value", hour)
value, ok := cache.Get(ttlcache.StringKey("some key"))
if !ok {
    // there is no record with key "some key" in the cache. Probably it has been expired.
}

fmt.Println(value.(string)) // This is necessary type assertion, because returned value is of interface{} type.

}

Performance

If you're interested in benchmarks you can check them in repository. Just play with numbers and types and check that library is suitable for your purposes.

go test -bench=. -benchmem

For those of us who wants to get some numbers without downloading unknown stuff (MacBook Pro 16"):

BenchmarkCache_Set_100-16 8959221 125 ns/op BenchmarkCache_Set_1000-16 9177854 123 ns/op BenchmarkCache_Set_10000-16 9247304 131 ns/op BenchmarkCache_Get_100-16 50562800 23.9 ns/op BenchmarkCache_Get_1000-16 47270793 26.9 ns/op BenchmarkCache_Get_10000-16 42578484 27.7 ns/op